The Burlington waterfront and skyline are seen from the University of Vermont research vessel "Melosira" as a group of storm and waste water professionals tour two sites on Lake Champlain affected by those outflows on Thursday, September 9, 2017.(Photo: GLENN RUSSELL/FREE PRESS FILE)Buy Photo

The National Weather Service said Tuesday afternoon that Burlington had officially marked a heat wave when the temperature reached 90 degrees for the third day.

The 90-degree temperature, hit at 2 p.m., smashed the record high for the day of 84 degrees in 1934, said John Goff, lead forecaster at the local Weather Service office.

Burlington saw record highs on Sunday and Monday as well. On Sunday the temperature of 91 degrees broke the record of 84 degrees in 1961; and on Monday a record that lasted for 126 years — 85 degrees in 1891 — was broken when the temperature reached 92 degrees.

Water temperature in Lake Champlain was measured at 72 degrees Tuesday morning — the warmest-ever recorded this late in the season, according to a social media post from the National Weather Service.

Reliable water temperature records go back to 1985, the service added.

Heat-related blooms of cyanobacteria, or blue-green algae, closed most of Burlington's beaches on Monday — a precaution taken by city officials against sickening toxins that are sometimes released by the organism.